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            <h3 id="双向数据绑定的原理"><a href="#双向数据绑定的原理" class="headerlink" title="双向数据绑定的原理"></a>双向数据绑定的原理</h3><p>在学习Vue和Angular过程中都有一个双向数据绑定的一个东西，Vue中是v-model ,Angular中是ng-model,那他们是怎么实现的，<br>先说是怎么实现的吧，自己也网上找了一下实现的方法，找到了一个比较简洁的实现方法(可能不是vue或者angular源码的实现方法)，仅自己理解的实现方法。<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">&lt;div class=&quot;box&quot;&gt;</span><br><span class="line">     &lt;input type=&quot;text&quot; id=&quot;model&quot;&gt;</span><br><span class="line">     &lt;span id=&quot;bind&quot;&gt;&lt;/span&gt;</span><br><span class="line">&lt;/div&gt;</span><br></pre></td></tr></table></figure></p>
<p>js代码：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;script&gt;</span><br><span class="line">        model=document.getElementById(&quot;model&quot;);</span><br><span class="line">        bind=document.getElementById(&quot;bind&quot;);</span><br><span class="line">        </span><br><span class="line">        window.onload=function()&#123;</span><br><span class="line">            model.oninput=function()&#123;</span><br><span class="line">                bind.innerHTML=model.value;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure></p>
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<p>定义和用法<br>oninput 事件在用户输入时触发。<br>该事件在 <code>&lt;input&gt;</code>或 <code>&lt;textarea&gt;</code>元素的值发生改变时触发。<br>提示： 该事件类似于 onchange 事件。不同之处在于 oninput 事件在元素值发生变化是立即触发， onchange 在元素失去焦点时触发。另外一点不同是 onchange 事件也可以作用于 <code>&lt;keygen&gt;</code> 和 <code>&lt;select&gt;</code> 元素。</p>
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<p><strong>逻辑就是使用oninput事件获取每次输入input的value的值，然后使用innerHTML赋给span</strong></p>

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